Diaphragm-pump.



A UNITED ASTATES" PATENT OFF1OE.

DIPHRAGNl-PUMP.

.To a/ZZ whom t may concern.- I

Be it known 'that we, FRANK BRIGGs and GEORGE N, BRIeGs, citizens of theUnited States, residing at` Yountville, in the county of Napa and Stateof California, have invented new and useful Improvements in Diaphragm-Pumps, of which the following is a specication.

Our invention relates to improvements in pumping apparatus, andparticularly inthatv class of pumps. known as diaphragm-pumps asdistinguished from the ordinary plungerpumps. Its object is to provide asimple practical pump devoid of bushings through vwhich leak may occurand convertible at will from a lift to a force pump, or vice versa.

It consists of the parts and 'the construction and combination of parts,as hereinafter more fully described and claimed, having reference to theaccompanying drawings, in wh1ch- Figure 1 isa central Vertical sectionofour apparatus. Fig. 2 is a section on line fr of Fig. 1.

f A represents a shell formed in two separable sections, between whichis secured at the edges a flexible vibrating diaphragm 2, di-

viding the interior of the casin-ginto respecl tive upper and lowerchambers 3 L1. .This diaphragm has a central opening, and secured to theupper and lower sides of the diaphragm and surrounding said opening arethe rings a I), the former of which is made in the form of `a spiderwith ports and with a central hub portion c, having a threaded openingto receive the lower threaded end of a plungerrod 5, reciprocal by anysuitable and wellknown means. On top of the upper ring a a loose diskvalve is adapted to seat, said valvel latter iirmly and uniformly to itsseat when the nut 9 and sleeve are turned in one direction, and thusprevent the passage of any Water from chamber 3 into lchamber 4:. Suchis the position of valve 7 when the lpump is used as a force-pump. Inthat case the wav Specification of Letters Patent. Application filedJune 4, 1904:. Serial No. 211,166.

Ratented septjaa-ieos.

ter entering through-the valved intake-pipe 1l on the upstroke of thediaphragm is discharged from chamber 3 on the same side of the diaphragmas inlet 11 through the valved f outlet 12. .When the pump is to be usedas an ordinary lift-pump, the sleeve 8 and Bange 10 are moved upward tofree valve 7 and allow it to open on the downstroke of the diaphragm,whereupon the fluid in chamber 3 passes through port 6 into upperchamber 4 vand flows thence by gravity through 'outlet 13. By shiftingthe sleeve to an intermediate position the size of port 6 may beregulated relative to the capacity of the pump, so that the latter mayact simultaneously both as a lift and as a forcepump.

Return from chamber 3 into intake-pipe 11 is prevented by means of aweighted flap-valve4 14:, which has one end secured to a part 15,forming a closure for a valve-recess in the lower section of the casing.This closure part, which is here shown as bolted to the casing fromtheoutside, permits the valve to be gotten at very easily without havingto disturb any of the/rest of the pump.

rlhe advantage of this pump over the ordinary piston or valve pump isthat there is very little friction, a perfect vacuum is formed in thelift-chamber 3, the pump is convertible readily from a lift to a forcepump, or vice versa, and when used as a force-pump there are no bushingsthrough which leakage may occur.

Having thus described our invention, what we claim, and desire to secureby Letters Patent, is-

1. An improved diaphragm-pump having in combination a divided casing anda diaphragm secured vbetween the parts thereof said diaphragm vhaving acentral opening, rings securedy to the upper and lower surfaces ofthediaphragm and surrounding said opening, one of said rings having acentral hub portion, a disk -valve adapted to seat upon the upper ofsaid rings, and having a central opening, a plunger-rod passing throughsaid opening in the valve and having its lower end fixed in the centralhub ,portion of the upper ring, a sleeve concentric with the rod, andmeans whereby the sleeve may be adjusted relative to the rod, saidVsleeve having an enlarged foot-piece adapted. to clamp the valve tightly.against the upper ring to shut olf communication with the chamber belowthe diaphragm, and said foot-piece serving as a stop to limit .theopening movement of the valve IOO IlO

when the sleeve is adjusted toward the outer end of the plunger-rod,whereby the Chambers above and below the diaphragm communicate, and aseparate outlet from each chamber.

2. A convertible diaphragm-pump having, as a unitary structure, adivided casing and a centrally-apertured flexible diaphragm securedbetween the two parts of the casing said diaphragm having its aperturereinforced, a non-rotatable guide fixed centrally in the aperture of thediaphragm, a Sleeve of less length than the guide and slidably mountedthereon, said sleeve having, at one end, an adjusting-nut engaging athreaded portion of the guide whereby the sleeve is movable vertieallyon said guide, and having a foot-piece or stop at the opposite end, anda iiexible disk valve loose upon the guide and having a eentral openingthrough which the guide passes whereby the guide directs the loose valvein its opening and closing movements from and toward the aperture in thediaphragm.

In testimony whereof we have hereunto set our hands in presence of twosubscribing witnesses.

FRANK BRIGGS. GEORGE N. BRIUGS.

Titnessey CHAS. E. TROWER, ARTHUR WH E ELEE.

